4. Consider the following controls in an automobile in motion: gas pedal, brake, steering wheel. What are the controls in this list that cause an acceleration of the car? (a) all three controls (b) the gas pedal and the brake (c) only the brake (d) only the gas pedal (e) only the steering wheel (f) none Borough of Manhattan CC FIRST EXAMINATION 5. A particle moves in a circular path of radiusr with speed v. It then increases its speed to 2v while traveling along the same circular path. By what factor has the period of the particle changed? (а) 0.25 (b) 0.5 (c) 2 (d) 4 (e) impossible to determine (f) none

4. Consider the following controls in an automobile in motion: gas pedal, brake, steering wheel. What are the controls in this list that cause an acceleration of the car? (a) all three controls (b) the gas pedal and the brake (c) only the brake (d) only the gas pedal (e) only the steering wheel (f) none Borough of Manhattan CC FIRST EXAMINATION 5. A particle moves in a circular path of radiusr with speed v. It then increases its speed to 2v while traveling along the same circular path. By what factor has the period of the particle changed? (а) 0.25 (b) 0.5 (c) 2 (d) 4 (e) impossible to determine (f) none